Please help 20 points.
Marco went to the library. He checked out 6 movies. The rest of the items he checked out were books. He checked out a total of 17 items. How many books did he check out?
Use the variable b to represent the number of books Marco checked out.
Which equation represents this situation and its solution?
6b = 17; b = 23
b + 6 = 17; b = 11
b + 23 = 17; b = 6
23b = 17; b = 6